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PROJECTION MICROSCOPES ON THE MARKET [Cn. IX 



FIG. 177. DIAGRAM SHOWING THE COURSE OF THE RAYS FOR LANTERN 

 SLIDES AND FOR MICROSCOPIC OBJECTS IN A. VERTICAL AND IN A 

 HORIZONTAL POSITION WITH MODEL 8 DELINEASCOPE. 



(Cut loaned by the Spencer Lens Co.). 



T Table for opaque objects. 



W Wheel by which the table is raised and lowered. 



D Diaphragm which may be used above the table. 



B Bulb which always illuminates the interior of the machine. 



C Condensing lenses in front of the arc. 



Large objective for opaque work. 



1 Smaller objectives for vertical attachment. 



M Mirror for throwing light downward to the lantern slide. 



M l Mirror for throwing a perpendicular beam out through the lantern- 

 slide compartment. 



M., Mirror used in connection with the projection of the vertical side of an 

 object. 



M., Mirror which assumes a position of 45 when the microscope is used 

 perpendicularly. 



P Prism which is used in the prism chamber when the microscope is used 

 perpendicularly or for drawing on a horizontal surface when the microscope 

 is horizontal. 



S .Shelf upon which the lantern slide is placed previous to throwing it up 

 into the optical axis by the handle. 



II Handle of the lever for raising lantern slides into position. 



